Pathology Outlines Invasive melanoma Oral Melanoacanthoma: Case Series of 33 Cases and Review of the Literature Head and Neck Pathology Springer Nature Link PDF] Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis. Semantic Scholar This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions